Subtle Signs You Might Be Under Fueling (Important Information for Endurance Athletes)
- Ashton George
- May 4
- 3 min read
If you had to guess… would you say you’re eating enough to support your training? Most athletes would say yes. But here’s the reality: A lot of athletes—especially busy moms, professionals, and those trying to “balance it all”—are unintentionally under-fueled.
Not because they’re trying to…But because it’s easy to miss.
Under-fueling doesn’t always look extreme. It often shows up in small, subtle ways that are easy to overlook or explain away. Let’s talk about a few of those signs.
1. You’re Constantly Thinking About Food
This goes beyond normal hunger.
If you’re:
Thinking about your next meal shortly after eating
Scanning for snacks throughout the day
Feeling distracted by food thoughts
That’s not a lack of willpower. That’s your body asking for more energy.
2. Your Easy Workouts Don’t Feel Easy
One of the biggest red flags I see with athletes:
Your Zone 2 run or ride suddenly feels… hard.
Heart rate creeping higher than usual
Pace feels unsustainable
Effort feels off for no clear reason
Low fuel availability = higher perceived effort. Your body simply doesn’t have what it needs to support the workload.
3. You Crash in the Afternoon
We’re not talking about a slight dip in energy.
This looks like:
Brain fog
Irritability
Reaching for caffeine just to function
This is often a sign you didn’t fuel enough earlier in the day (especially around your morning training).
4. You’re Sore All the Time
Yes, training causes fatigue.
But if you’re:
Constantly sore
Taking longer to recover than usual
Feeling “beat up” from workouts that should be manageable
Your body likely doesn’t have enough fuel to repair and rebuild. Recovery isn’t just rest—it’s also nutrition.
5. Your Sleep Feels Off
This one surprises a lot of athletes.
Under fueling can lead to:
Waking up in the middle of the night
Restless or lighter sleep
Feeling wired but tired
Low energy availability can increase stress hormones, making it harder to fully recover overnight.
6. You Feel Flat in Your Workouts
Not necessarily slower… just off.
Lack of motivation
Hard to “push” when needed
Feeling disconnected from your effort
This is often your body conserving energy. It’s not a mindset issue—it’s a fueling issue.
7. You’re Getting Sick More Often
Frequent colds, lingering fatigue, or just feeling run down. When your body doesn’t have enough energy, it prioritizes survival over performance—including your immune system.
8. You’re Doing Everything “Right”… But Not Improving
You’re:
Consistent with training
Showing up for workouts
Following the plan
…but not seeing progress. Fueling might be the missing piece; because training is only one side of the equation.
So… What Should You Do About It?
If any of these hit close to home, don’t panic. You don’t need to overhaul everything overnight.
Start here:
1. Fuel Your Workouts
Don’t train on empty—especially for key sessions. Even something small can make a big
difference.
2. Add (Don’t Restrict)
Instead of cutting things out, focus on what you can add:
More carbs around training
An extra snack
Better post-workout recovery
3. Stop Trying to “Earn” Your Food
Your nutrition should support your training—not be a reward for it.
Final Thoughts
Under-fueling doesn’t always look obvious. Sometimes it’s just… not quite enough, consistently. And over time, that gap adds up—impacting your energy, recovery, and performance. The goal isn’t perfection. It’s awareness. Because once you start fueling your body properly, you’ll be surprised how much better everything starts to feel.
If you’re recognizing yourself in even one of these signs, it’s worth paying attention.
At NVDM Coaching, we help endurance athletes dial in their fueling so their training actually translates into performance.
Ready to stop guessing and start fueling with purpose? Book your free consultation and we can start building a plan that supports your training, your life, and your goals.
